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The charge transport in the copper-oxygen chain/ladder layers of(La,Y)y(Sr,Ca)14-yCu24O41 is investigated along two crystallographic directionsin the temperature range from 50 K to 700 K and for doping levels from y ~= 6(number of holes nh < 1) to y = 0 (number of holes nh = 6). A crossover from aone-dimensional hopping transport along the chains for y >= 3 to aquasi-two-dimensional charge conduction in the ladder planes for y <~ 2 isobserved. This is attributed to a partial hole transfer from chains to ladderswhen the hole doping exceeds nh ~= 4 and approaches fully doped value n_h = 6.For y <~ 2 a weak dielectric relaxation at radio-frequencies and a microwavemode are detected, which might be recognized as signatures of a charge-densitywave phase developed at short length scales in the ladders planes.

Crossover from one-dimensional copper-oxygen chains to two-dimensional ladders charge transport in (La,Y)y(Sr,Ca)14-yCu24O41